From: Sandro Paganotti <sandro.paganotti@...>
Date: 2008-06-27T21:05:21+09:00
Subject: Re: define_method with block

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I've re-arranged a bit your code... maybe this way can be more nice-looking:
module Taikwando
       def self.add_warrior(n)
               define_method(n) do |blk|
                       puts "#{n} fights!"
                       blk.call
               end
       end

       def fight(*names)
               names.each do |n|
                       Taikwando.add_warrior(n)
               end
       end

       def moves (fighter,&block)
         self.send(fighter,block)
       end
end

include Taikwando

fight "morpheus", "neo"
moves("neo") do
  puts "karate chop!"
end


On Fri, Jun 27, 2008 at 11:48 AM, Leslie Viljoen <leslieviljoen@gmail.com>
wrote:

> On 6/27/08, Robert Klemme <shortcutter@googlemail.com> wrote:
> > 2008/6/27 Leslie Viljoen <leslieviljoen@gmail.com>:
> >
> >
> >  > Is there a way that methods defined with define_method can take a
> block?
> >  > Here's my fighting module:
> >  >
> >  > module Taikwando
> >  >        def self.add_warrior(n)
> >  >                define_method(n) do
> >  >                        puts "#{n} fights!"
> >  >                        yield
> >  >                end
> >  >        end
> >  >
> >  >        def fight(*names)
> >  >                names.each do |n|
> >  >                        Taikwando.add_warrior(n)
> >  >                end
> >  >        end
> >  > end
> >  >
> >  > include Taikwando
> >  >
> >  >
> >  >
> >  > ..when I require it, I can do this:
> >  >
> >  >>> fight "morpheus", "neo"
> >  > => ["morpheus", "neo"]
> >  >>> neo do
> >  > ?> puts "karate chop!"
> >  >>> end
> >  > neo fights!
> >  > LocalJumpError: no block given
> >  >        from ./kungfu.rb:102:in `neo'
> >  >        from (irb):5
> >  >
> >  >
> >  > - the yield does not work. Any ideas?
> >
> >
> > AFAIK there is no way (yet) to define a method that needs a block via
> >  define_method.  I believe you can try to work around this by doing
> >
> >  self.class.class_eval "def #{m}; puts '#{m} fights'; yield; end"
> >
> >  Kind regards
> >
> >  robert
> >
>
> I can explicitly pass a block to my fight method too, but it's so ugly:
> neo(lambda do
> puts "flying kick"
> end
> )
>
>
>
>
> >
> >  --
> >  use.inject do |as, often| as.you_can - without end
> >
> >
>
>
> --
> [we need your code-fu]  :  www.zadic.co.za
>
>


-- 
Dan Quayle  - "It's time for the human race to enter the solar system."

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